poll.h

/*** This file is part of PulseAudio. Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB PulseAudio is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. PulseAudio is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with PulseAudio; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.***//*** Based on work for the GNU C Library. Copyright (C) 1994,96,97,98,99,2000,2001,2004 Free Software Foundation, Inc.***//* Event types that can be polled for. These bits may be set in `events' to indicate the interesting event types; they will appear in `revents' to indicate the status of the file descriptor. */#define POLLIN 0x001 /* There is data to read. */#define POLLPRI 0x002 /* There is urgent data to read. */#define POLLOUT 0x004 /* Writing now will not block. *//* Event types always implicitly polled for. These bits need not be set in `events', but they will appear in `revents' to indicate the status of the file descriptor. */#define POLLERR 0x008 /* Error condition. */#define POLLHUP 0x010 /* Hung up. */#define POLLNVAL 0x020 /* Invalid polling request. *//* Type used for the number of file descriptors. */typedefunsignedlongint nfds_t;
/* Data structure describing a polling request. */struct pollfd
{
int fd; /* File descriptor to poll. */shortint events; /* Types of events poller cares about. */shortint revents; /* Types of events that actually occurred. */
};
/* Poll the file descriptors described by the NFDS structures starting at FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for an event to occur; if TIMEOUT is -1, block until an event occurs. Returns the number of file descriptors with events, zero if timed out, or -1 for errors. */externint poll (struct pollfd *__fds, nfds_t __nfds, int __timeout);